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AD9739A-fmc-ebz SPI issue

Question asked by bill888 on Dec 3, 2014
Latest reply on Jan 12, 2015 by danf

I have two AD9739A-fmc-ebz boards that I am running with two ZED boards. When I switched from using the internal clock on the DAC boards to using the external clock the SPI communication through the fmc connector failed. I presumed that this was because the SPI signals go to the ADF4350, which is now powered down and corrupting those signals. In trouble shooting this I also noticed that one of the 33 ohm resistors (per the schematic) is really 98 ohms. This is the case on both boards. Has anyone had this experience or know of a solution?

 

Thanks,

Bill

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